Improvement in mold-boards for plows



vLLANB,

f Mold Board for Plow.`

, No 107,925. 'Patented 00L 4,1870E VVz/eggekmw' i i i Y I 25,; gaa@ M PETERS, PHcTo-LrrNOGRAPMER. WASHINGTON, D. C.

IUNr'rnD STATES PATENT OFFICE.

`JOHN LANE, 0F oHIoAeo, ILLiNoIs, AssreNon 'ro HAreooD a co., oF

sAME PLAGE.

" IMPROVEMENT IN MOLD-BOARDS FOR PLOWS.

Specification forming part of Letters Patent No. 107,925, dated vOctober 4, 1870.'

To all whom it may concern:

Be it known that I, JOHN LANE, of Chicago, in the county of Cook and State ot' Illinois, have invented certainvnew and useful Improvements in Mold-Boards for Plows; and I do hereby declare that the following is a full,

clear, and exact description thereof, referenceA being had to the accompanying drawings, making part of this specification, and to the letters of reference marked thereon, like letters indicating like parts wherever they occur.

To enable Others skilled in the art to construct and use my invention, I will proceed to describe it.

My invention :relates to plows 5 and the invention consists in a novel constrction ofthe mold-board, whereby the part that receives the most wear is made of a variable thickness, corresponding to the varying wear, as hereinafter more fully explained.

Figure l is a face or side view of my improved mold-board 5 Fig. 2, a rear end view; Fig. 3, a'front end view; Fig. 4, a bottom edge view; Fig. 5, a section on the line y y; Fig. 6, a section on the line tv; and Fig. 7, a plan view ot' a plate, representing the man ner of cntting out the blanks.

Various plans have heretofore been devised for rendering the moldboards of plows more Y durable.

This has generally been done by making them thicker along the shim, and also by cutting the blank from a sheet rolled thicker in one part than another 5 but no one, so far as I am aware, has ever attempted to carry out this idea, so as to produce a mold-board the thickness ot' which should vary in accordance with the pressure or friction to which it is subjected in `useon the various parts of the surface. rDhis is my prcsentinvention, and to accomplish it I proceed as follows:

I take a plate, B, as represented iu Fig. 7, which is rolled of a uniformthickness from each edge inward to the line I, from whence it increases uniformly in thickness to the cen tral line, m. From this plate I cut the blanks A, in'the manner or on the plan shown in Fig. 7, by which it will be seen that the blank will have 'a regularly-increasing thickness from the line l to the line m, and that that part ofthe point which projects over the line m, and which is designated by theletter r, will decrease in thickness in a corresponding ratio. Io compensate for this decreasing thickness of the part r, I cut the lower edge, c, with a curve instead of on a straight line, whereby an excess of metal is obtained at that point, and by upsetting which the point may be provided with a sufficient body of metal to increase its thickness all theway to the extreme point. It

is obvious that this surplus metal may be procreasing thickness along one edge only; but y the former plan is preferred because it is more economical. When t-he blanks are thus cut out they have their points upset, either by a suitably constructed press or by hand, to such an extent as to give the necessary thickness to continue the increase all the way out to the. point.` When thus completed the mold-board will have its front of a regularly-increasing thickness from top' to bottom, as shown at a, Fig. 3, and also ofa regularly-decreasing thickness from the front edge back to the line m of Fig. 1, which corresponds with the line l of Fig. 7 5 or, in other words, that portion of the moldbloard in front of the line fr: x, Fig. l, will increase regularly in thickness from that line to the front edge, and also from top to bottom, as represented by Figs. 8, 4, 5, and 6. Itis this partof the mold-board which receives the greatest amount of friction and consequent wear, and this wear is greatest at the lower part, decreasing gradually from the point backward and upward, sothat when the mold-board is constructed as described it will be seen that it has a varying thickness corresponding with the varyin g pressure and wear to which its various parts are subjected in use.

It is obvious that the pressure and wear will vary according as theform and size of the moldboard is changed, the exact points on its surface at which the increase of pressure ceases being dependent., somewhat at least, on the length and curvature of the mold-board, and that in carrying out and applying my invention to all styles of plows these points must be decreasing along the landside or shim end of taken into consideration. As, however, the the mold-board when made substantially in great lnass of steel plows made in thc West are the manner herein set forth. of Very nearly a uniform curve, the foregoing is sufficient for all practical purposes.

Having thus described my invention, what I A plow mold-board having the greatest thickness at the point and the thickness gradually JOHN LANE. Witnesses:

JULrUs A. LANE, 

